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1. Evolution of single-particle strength in neutron-rich 71Cu

Author: P. Morfouace, S. Franchoo, K. Sieja, I. Matea, L. Nalpas, M. Niikura, A.M. Sánchez-Benítez, I. Stefan, M. Assié, F. Azaiez, D. Beaumel, S. Boissinot, C. Borcea, R. Borcea, G. Burgunder, L. Cáceres, N. De Séréville, Zs. Dombrádi, J. Elseviers, B. Fernández-Domínguez, A. Gillibert, S. Giron, S. Grévy, F. Hammache, O. Kamalou, V. Lapoux, L. Lefebvre, A. Lepailleur, C. Louchart, G. Marquinez-Duran, I. Martel, A. Matta, D. Mengoni, D.R. Napoli, F. Recchia, J.-A. Scarpaci, D. Sohler, O. Sorlin, M. Stanoiu, C. Stodel, J.-C. Thomas, and Zs. Vajta
Subjects: Physics, QC1-999
Abstract: The strength functions of the πf5/2, πp3/2 and πf7/2 orbitals in neutron-rich 71Cu were obtained in a 72Zn(d,3He)71Cu proton pick-up reaction in inverse kinematics using a radioactive beam of 72Zn at 38 MeV/u. A dedicated set-up was developed to overcome the experimental challenges posed by the low cross section of the reaction and the low energy of the outgoing 3He particles. The excitation-energy spectrum was reconstructed and spectroscopic factors were obtained after analysis of the angular distributions with the finite-range Distorted-Wave Born Approximation (DWBA). The results show that unlike for the πf5/2 orbital and contrary to earlier interpretation, the πf7/2 single-particle strength distribution is not appreciably affected by the addition of neutrons beyond N=40.
Published: 2015
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2. Charged-particle branching ratios above the neutron threshold in $^{19}$F: constraining $^{15}$N production in core-collapse supernovae

Author: Adsley, P., Hammache, F., de Séréville, N., Alcindor, V., é, M. Assi, Chabot, D. Beaumel M., Degerlier, M., Delafosse, C., Faestermann, T., Flavigny, F., Fox, S. P., Garg, R., Georgiadou, A., Gillespie, S. A., Guillot, J., Hertenberger, R., Guimarães, V., Gottardo, A., Kiener, J., Laird, A. M., Lefebvre-Schuhl, A., Matea, I., Meyer, A., Mahgoub, M., Olivier, L., Perrot, L., Riley, J., Sivacek, I., Stefan, I., Tatischeff, V., and Wirth, H. -F.
Subjects: Nuclear Experiment, Astrophysics - Solar and Stellar Astrophysics
Abstract: Spatially-correlated overabundances of $^{15}$N and $^{18}$O observed in some low-density graphite meteoritic grains have been connected to nucleosynthesis taking place in the helium-burning shell during core-collapse supernovae. Two of the reactions which have been identified as important to the final abundances of $^{15}$N and $^{18}$O are $^{18}$F($n,\alpha$)$^{15}$N and $^{18}$F($n,p$)$^{18}$O. The relative strengths of the $^{18}$F($n,\alpha$)$^{15}$N and $^{18}$F($n,p$)$^{18}$O reactions depend on the relative $\alpha_0$ and $p_0$ decays from states above the neutron threshold in $^{19}$F in addition to other properties. Experimental data on the charged-particle decays from these highly excited states are lacking or inconsistent. Two experiments were performed using proton inelastic scattering from LiF targets and magnetic spectrographs. The first experiment used the high-resolution Q3D spectrograph at Munich to constrain properties of levels in $^{19}$F. A second experiment using the Orsay Split-Pole spectrograph and an array of silicon detectors was performed in order to measure the charged-particle decays of neutron-unbound levels in $^{19}$F. A number of levels in $^{19}$F have been identified along with their corresponding charged-particle decays. The first state above the neutron threshold which has an observed proton-decay branch to the ground state of $^{18}$O lies 68 keV above the neutron threshold while the $\alpha$-particle decays from the neutron-unbound levels are generally observed to be much stronger than the proton decays. Neutron-unbound levels in $^{19}$F are observed to decay predominantly by $\alpha$-particle emission, supporting the role of $^{18}$F($n,\alpha$)$^{15}$N in the production of $^{15}$N in the helium-burning shell of supernovae. Improved resonant-scattering reaction data are required in order to be able to determine the reaction rates accurately., Comment: 13 pages, 5 figures, v3 more wrong affiliations
Published: 2020
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3. Multiple Mechanisms in Proton-Induced Nucleon Removal at ∼100 MeV/Nucleon

Author: T. Pohl, Y. L. Sun, A. Obertelli, J. Lee, M. Gómez-Ramos, K. Ogata, K. Yoshida, B. S. Cai, C. X. Yuan, B. A. Brown, H. Baba, D. Beaumel, A. Corsi, J. Gao, J. Gibelin, A. Gillibert, K. I. Hahn, T. Isobe, D. Kim, Y. Kondo, T. Kobayashi, Y. Kubota, P. Li, P. Liang, H. N. Liu, J. Liu, T. Lokotko, F. M. Marqués, Y. Matsuda, T. Motobayashi, T. Nakamura, N. A. Orr, H. Otsu, V. Panin, S. Y. Park, S. Sakaguchi, M. Sasano, H. Sato, H. Sakurai, Y. Shimizu, A. I. Stefanescu, L. Stuhl, D. Suzuki, Y. Togano, D. Tudor, T. Uesaka, H. Wang, X. Xu, Z. H. Yang, K. Yoneda, and J. Zenihiro
Subjects: General Physics and Astronomy
Published: 2023
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4. Structure of Ca36 under the Coulomb Magnifying Glass

Author: L. Lalanne, O. Sorlin, A. Poves, M. Assié, F. Hammache, S. Koyama, D. Suzuki, F. Flavigny, V. Girard-Alcindor, A. Lemasson, A. Matta, T. Roger, D. Beaumel, Y. Blumenfeld, B. A. Brown, F. De Oliveira Santos, F. Delaunay, N. de Séréville, S. Franchoo, J. Gibelin, J. Guillot, O. Kamalou, N. Kitamura, V. Lapoux, B. Mauss, P. Morfouace, M. Niikura, J. Pancin, T. Y. Saito, C. Stodel, and J-C. Thomas
Subjects: General Physics and Astronomy
Published: 2022
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5. New narrow resonances observed in the unbound nucleus F15

Author: V. Girard-Alcindor, A. Mercenne, I. Stefan, F. de Oliveira Santos, N. Michel, M. Płoszajczak, M. Assié, A. Lemasson, E. Clément, F. Flavigny, A. Matta, D. Ramos, M. Rejmund, J. Dudouet, D. Ackermann, P. Adsley, M. Assunção, B. Bastin, D. Beaumel, G. Benzoni, R. Borcea, A. J. Boston, D. Brugnara, L. Cáceres, B. Cederwall, I. Celikovic, V. Chudoba, M. Ciemala, J. Collado, F. C. L. Crespi, G. D'Agata, G. De France, F. Delaunay, C. Diget, C. Domingo-Pardo, J. Eberth, C. Fougères, S. Franchoo, F. Galtarossa, A. Georgiadou, J. Gibelin, S. Giraud, V. González, N. Goyal, A. Gottardo, J. Goupil, S. Grévy, V. Guimaraes, F. Hammache, L. J. Harkness-Brennan, H. Hess, N. Jovančević, D. S. Judson Oliver, O. Kamalou, A. Kamenyero, J. Kiener, W. Korten, S. Koyama, M. Labiche, L. Lalanne, V. Lapoux, S. Leblond, A. Lefevre, C. Lenain, S. Leoni, H. Li, A. Lopez-Martens, A. Maj, I. Matea, R. Menegazzo, D. Mengoni, A. Meyer, B. Million, B. Monteagudo, P. Morfouace, J. Mrazek, M. Niikura, J. Piot, Zs. Podolyak, C. Portail, A. Pullia, B. Quintana, F. Recchia, P. Reiter, K. Rezynkina, T. Roger, J. S. Rojo, F. Rotaru, M. D. Salsac, A. M. Sánchez Benítez, E. Sanchis, M. Şenyigit, N. de Séréville, M. Siciliano, J. Simpson, D. Sohler, O. Sorlin, M. Stanoiu, C. Stodel, D. Suzuki, C. Theisen, D. Thisse, J. C.Thomas, P. Ujic, J. J. Valiente-Dobón, and M. Zielińska
Published: 2022
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6. Occupation probabilities of valence orbitals relevant to neutrinoless double β decay of Sn124

Author: A. Shrivastava, K. Mahata, I. Stefan, M. Assié, P. Adsley, D. Beaumel, V. M. Datar, A. Georgiadou, J. Guillot, F. Hammache, N. Keeley, Y. H. Kim, A. Meyer, V. Nanal, V. V. Parkar, and N. de Séréville
Published: 2022
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7. Structure of ^{36}Ca under the Coulomb Magnifying Glass

Author: L, Lalanne, O, Sorlin, A, Poves, M, Assié, F, Hammache, S, Koyama, D, Suzuki, F, Flavigny, V, Girard-Alcindor, A, Lemasson, A, Matta, T, Roger, D, Beaumel, Y, Blumenfeld, B A, Brown, F De Oliveira, Santos, F, Delaunay, N, de Séréville, S, Franchoo, J, Gibelin, J, Guillot, O, Kamalou, N, Kitamura, V, Lapoux, B, Mauss, P, Morfouace, M, Niikura, J, Pancin, T Y, Saito, C, Stodel, and J-C, Thomas
Abstract: Detailed spectroscopy of the neutron-deficient nucleus ^{36}Ca was obtained up to 9 MeV using the ^{37}Ca(p,d)^{36}Ca and the ^{38}Ca(p,t)^{36}Ca transfer reactions. The radioactive nuclei, produced by the LISE spectrometer at GANIL, interacted with the protons of the liquid hydrogen target CRYPTA, to produce light ejectiles (the deuteron d or triton t) that were detected in the MUST2 detector array, in coincidence with the heavy residues identified by a zero-degree detection system. Our main findings are (i) a similar shift in energy for the 1_{1}^{+} and 2_{1}^{+} states by about -250 keV, as compared with the mirror nucleus ^{36}S; (ii) the discovery of an intruder 0_{2}^{+} state at 2.83(13) MeV, which appears below the first 2^{+} state, in contradiction with the situation in ^{36}S; and (iii) a tentative 0_{3}^{+} state at 4.83(17) MeV, proposed to exhibit a bubble structure with two neutron vacancies in the 2s_{1/2} orbit. The inversion between the 0_{2}^{+} and 2_{1}^{+} states is due to the large mirror energy difference (MED) of -516(130) keV for the former. This feature is reproduced by shell model calculations, using the sd-pf valence space, predicting an almost pure intruder nature for the 0_{2}^{+} state, with two protons (neutrons) being excited across the Z=20 magic closure in ^{36}Ca (^{36}S). This mirror system has the largest MEDs ever observed, if one excludes the few cases induced by the effect of the continuum.
Published: 2021

8. Probing nuclear forces beyond the nuclear drip line: the cases of $^{16}$F and $^{15}$F: A Tribute to Mahir Hussein

Author: L. Caceres, A.M. Sánchez Benítez, Igor T. Čeliković, A. Matta, D. Verney, F. Rotaru, Valdir Guimaraes, P. Adsley, O. Sorlin, J. Guillot, T. Roger, C. Portail, V. Girard-Alcindor, I. Matea, A. Georgiadou, C. Petrone, D. Pantelica, R. Borcea, D. Suzuki, O. Kamalou, V. Lapoux, Megumi Niikura, I. Stefan, J. Piot, F. Flavigny, G. D’Agata, F. de Oliveira Santos, M. Ciemala, V. Tatischeff, V. Chudoba, L. Lalanne, C. Stodel, J. C. Thomas, N. Goyal, M. Stanoiu, C. Fougeres, S. Grévy, F. Negoita, N. de Séréville, L. Perrot, G. Dumitru, M. Assie, A. Meyer, J. C. Angelique, Marlete Assunção, Nicolas Michel, F. Hammache, D. Beaumel, S. Franchoo, Predrag Ujić, Dieter Ackermann, Shoko Koyama, F. de Grancey, J. Kiener, E. Berthoumieux, P. Morfouace, J. Mrazek, K. Subotic, Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Elastic scattering, Physics, Nuclear and High Energy Physics, Proton, 010308 nuclear & particles physics, media_common.quotation_subject, Hadron, Nuclear Theory, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Asymmetry, Excited state, 0103 physical sciences, Nuclear force, Mirror nuclei, Atomic physics, 010306 general physics, Wave function, Nuclear Experiment, media_common
Abstract: The unbound proton-rich nuclei $$^{16}$$ F and $$^{15}$$ F are investigated experimentally and theoretically. Several experiments using the resonant elastic scattering method were performed at GANIL with radioactive beams to determine the properties of the low lying states of these nuclei. Strong asymmetry between $$^{16}$$ F– $$^{16}$$ N and $$^{15}$$ F– $$^{15}$$ C mirror nuclei is observed. The strength of the $$nucleon-nucleon$$ effective interaction involving the loosely bound proton in the $$s_{1/2}$$ orbit is significantly modified with respect to their mirror nuclei $$^{16}$$ N and $$^{15}$$ C. The reduction of the effective interaction is estimated by calculating the interaction energies with a schematic zero-range force. It is found that, after correcting for the effects due to changes in the radial distribution of the single-particle wave functions, the mirror symmetry of the $$n-p$$ interaction is preserved between $$^{16}$$ F and $$^{16}$$ N, while a difference of 63% is measured between the $$p-p$$ versus $$n-n$$ interactions in the second excited state of $$^{15}$$ F and $$^{15}$$ C nuclei. Several explanations are proposed.
Published: 2021
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9. HeCTOr: the $^3$He Cryogenic Target of Orsay for direct nuclear reactions with radioactive ion beams

Author: D. Brugnara, F. Galtarossa, F. Chatelet, D. Ramos, A. Lemasson, M. Assié, H. Saugnac, D. Mengoni, V. Delpech, E. Rindel, J. Goupil, F. Flavigny, D. Beaumel, A. Gottardo, Eric Clément, M. Pierens, A. Giret, L. Ménager, F. Galet, A. Matta, Marin Chabot, P. Blache, Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Dipartimento di Fisica e Astronomia G. Galilei, Università di Padova, Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Istituto Nazionale di Fisica Nucleare [Ferrara] (INFN), Istituto Nazionale di Fisica Nucleare (INFN), and European Project: 654002,H2020,H2020-INFRAIA-2014-2015,ENSAR2(2016)
Subjects: Nuclear reaction, Radioactive ion beams, Nuclear and High Energy Physics, Physics - Instrumentation and Detectors, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Nuclear physics, 0103 physical sciences, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Nuclear Experiment (nucl-ex), Nuclear Experiment, 010306 general physics, Absorption (electromagnetic radiation), Instrumentation, Physics, 010308 nuclear & particles physics, Scattering, Detector, Resolution (electron density), Instrumentation and Detectors (physics.ins-det), Particle, Beam (structure), Direct nuclear reactions, Cryogenic target
Abstract: Direct nuclear reactions with radioactive ion beams represent an extremely powerful tool to extend the study of fundamental nuclear properties far from stability. These measurements require pure and dense targets to cope with the low beam intensities. The $^3$He cryogenic target HeCTOr has been designed to perform direct nuclear reactions in inverse kinematics. The high density of $^3$He scattering centers, of the order of 10$^{20}$ atoms/cm$^2$, makes it particularly suited for experiments where low-intensity radioactive beams are involved. The target was employed in a first in-beam experiment, where it was coupled to state-of-the-art gamma-ray and particle detectors. It showed excellent stability in gas temperature and density over time. Relevant experimental quantities, such as total target thickness, energy resolution and gamma-ray absorption, were determined through dedicated Geant4 simulations and found to be in good agreement with experimental data., Comment: 12 pages, 10 figures
Published: 2021
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10. Evaluation of the N13(α,p)O16 thermonuclear reaction rate and its impact on the isotopic composition of supernova grains

Author: D. Beaumel, Fairouz Hammache, L. Audouin, M. G. Pellegriti, Marco Pignatari, Richard Longland, T. Lawson, S. Fortier, Vincent Tatischeff, A. Lefebvre-Schuhl, Anne Meyer, Alison Laird, N. de Séréville, Jürgen Kiener, and M. Stanoiu
Subjects: Physics, 010308 nuclear & particles physics, Monte Carlo method, chemistry.chemical_element, Context (language use), 7. Clean energy, 01 natural sciences, Reaction rate, Nuclear physics, Supernova, Stars, chemistry, 13. Climate action, 0103 physical sciences, Born approximation, 010306 general physics, Stellar evolution, Helium
Abstract: Background: It has been recently suggested that hydrogen ingestion into the helium shell of massive stars could lead to high C13 and N15 excesses when the shock of a core-collapse supernova passes through its helium shell. This prediction questions the origin of extremely high C13 and N15 abundances observed in rare presolar SiC grains which is usually attributed to classical novae. In this context the N13(α,p)O16 reaction plays an important role since it is in competition with N13β+ decay to C13. Purpose: The N13(α,p)O16 reaction rate used in stellar evolution calculations comes from the Caughlan and Fowler compilation with very scarce information on the origin of this rate and with no associated uncertainty. The goal of this work is to provide a recommended N13(α,p)O16 reaction rate, based on available experimental data, with a meaningful statistical uncertainty. Method: Unbound nuclear states in the F17 compound nucleus were studied using the spectroscopic information of the analog states in O17 nucleus that were measured at the Tandem-Alto facility using the C13(Li7,t)O17 α-particle-transfer reaction. The α-particle spectroscopic factors were derived using a finite-range distorted-wave Born approximation analysis. This spectroscopic information was used to calculate a recommended N13(α,p)O16 reaction rate with meaningful uncertainty using a Monte Carlo approach. Results: The N13(α,p)O16 reaction rate from the present work is found to be within a factor of two of the previous evaluation in the temperature range of interest, with a typical uncertainty of a factor ≈2-3. The source of this uncertainty has been identified to come from the three main contributing resonances at Erc.m.=221, 741, and 959 keV. This new error estimation translates to an overall uncertainty in the C13 production of a factor of 50 when using the lower and upper reaction rates in the conditions relevant for the N13(α,p)O16 activation. Conclusions: The main source of uncertainty on the re-evaluated N13(α,p)O16 reaction rate currently comes from the uncertain α-particle width of relevant F17 states.
Published: 2020
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11. Physics opportunities with the Advanced Gamma Tracking Array: AGATA

Author: W. Korten, A. Bracco, A. Atac, G. Benzoni, S. Leoni, P. Reiter, A. Goasduff, Eric Clément, K. A. Gladnishki, F. Recchia, A. Jungclaus, Bo Cederwall, G. Duchêne, D. G. Jenkins, A. Nannini, P. Bednarczyk, M. Zielińska, Dirk Rudolph, Riccardo Raabe, B. Million, A. Tumino, P. J. Nolan, D. R. Napoli, B. Fernández-Domínguez, F. Didierjean, Johan Nyberg, Herbert Hess, A. Gadea, D. Tonev, M. Ciemala, G. Rainovski, D. T. Doherty, Joakim Cederkäll, A. Obertelli, J. Gerl, J. J. Valiente-Dobón, B. Fornal, Begoña Quintana, J. Ljungvall, Ch. Theisen, Janne Pakarinen, G. de Angelis, P. R. John, M. Kmiecik, O. Wieland, Zs. Dombrádi, J. Simpson, A. J. Boston, M. Górska, Zs. Podolyák, D. Curien, J. Dudek, Norbert Pietralla, F. C. L. Crespi, A. Maj, K. Wimmer, Paul Greenlees, D. Beaumel, M. Labiche, A. Lopez-Martens, A. Korichi, M. A. Bentley, D. Mengoni, Liam Gaffney, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), AGATA, Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Ministerio de Ciencia, Innovación y Universidades (España), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Radioactive ion beams, Nuclear and High Energy Physics, NEUTRON-RICH, Position resolution, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Accelerator Physics and Instrumentation, Tracking (particle physics), 7. Clean energy, 01 natural sciences, Physics, Particles & Fields, Subatomär fysik, Optics, Subatomic Physics, 0103 physical sciences, Gamma spectroscopy, SPECTROMETER, ddc:530, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], SUPERHEAVY ELEMENTS, 010306 general physics, ROTATIONAL BAND, DETECTOR, Physics, Science & Technology, Spectrometer, 010308 nuclear & particles physics, business.industry, European research, Detector, Acceleratorfysik och instrumentering, FISSION-BARRIERS, PERFORMANCE, Physics, Nuclear, SPIN, Physical Sciences, SHELL-MODEL, AGATA, business, DECAY
Abstract: AGATA Collaboration, New physics opportunities are opening up by the Advanced Gamma Tracking Array, AGATA, as it evolves to the full 4π instrument. AGATA is a high-resolution γ-ray spectrometer, solely built from highly segmented high-purity Ge detectors, capable of measuring γ rays from a few tens of keV to beyond 10 MeV, with unprecedented efficiency, excellent position resolution for individual γ-ray interactions, and very high count-rate capability. As a travelling detector AGATA will be employed at all major current and near-future European research facilities delivering stable and radioactive ion beams., The AGATA project has been supported by the European Structural Funds FSE FEDER, the Academy of Finland FIRI program, Finland, the Direction de Recherches Fondamentales of CEA, France, the Institut National de Physique Nucléaire et de Physique des Particules (IN2P3) of CNRS, France, the Bundesministerium für Bildung und Forschung (BMBF), Germany, the Institute of Nuclear Research of the Hungarian Academy of Sciences (ATOMKI), Hungary, the IstitutoNazionale di Fisica Nucleare (INFN), Italy, theNational Science Center (NCN), Poland, the Knut and AliceWallenberg foundation (Sweden), the Swedish Research Council, the Conselleria d’Educació, Investigació, Cultura i Esport, Generalitat Valenciana and Ministerio de Ciencia, Innovación y Universidades, Spain, the Türkiye Bilimsel ve Teknolojik Ara¸stirma Kurumu (TÜBITAK), Turkey, and the United Kingdom Research and Innovation – Science and Technology Facilities Council (UKRI-STFC).
Published: 2020
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12. Experimental study of 4 n with 8He(p,2p) reaction

Author: M. Böhmer, Masaki Sasano, S. Reichert, Naohito Inabe, S. Chen, T. Shimada, M. Matsumoto, Susumu Shimoura, I. Stefan, J. Kahlbow, N. Kalantar-Nayestanaki, T. Harada, D. Symochko, István Kuti, S. W. Huang, D. Cortina, Tomohiro Uesaka, Z. Ge, N. L. Achouri, Yosuke Kondo, Hiroyuki Takeda, K. Yoneda, B. Fernández-Domínguez, U. Forsberg, Z. Elekes, Roman Gernhäuser, Y. Yasuda, H. Suzuki, Yohei Shimizu, D. Beaumel, D. Kim, C. A. Douma, Yukie Maeda, A. Hirayama, J. M. Gheller, Heiko Scheit, F. Dufter, T. Elidiano, Yasuhiro Togano, M. L. Cortés, M. Potlog, Nobuyuki Chiga, P. J. Li, Juzo Zenihiro, B. Yang, T. Isobe, M. Caamaño, Thomas Aumann, H. T. Törnqvsit, A. Gillibert, D. S. Ahn, F. Schindler, M.N. Harakeh, J. Feng, J. Tscheuschner, S. Kim, Atsumi Saito, L. Zanetti, P. Koseoglou, V. Wagner, M. Parlog, B. M. Godoy, N. Orr, Takashi Nakamura, Yu-xin Liu, J. Mayer, A. Obertelli, Yuya Kubota, Hideaki Otsu, S. Storck, S. Masuoka, K. Boretzky, Kathrin Wimmer, H. Miki, T. Tomai, F. M. Marqués, V. Panin, P. Doornenbal, Stefanos Paschalis, L. Yang, Satoshi Takeuchi, M. A. Knösel, Igor Gašparić, T. Kobayashi, C. Lehr, H. Yang, C. Lenain, M. Miwa, Z. Halász, A. Revel, H. Sato, T. Fujino, D. M. Rossi, H. Baba, S. Park, I. Murray, L. Stuhl, H. Yamada, J. Gibelin, J. Tanaka, Naoki Fukuda, RIKEN Nishina Center for Accelerator-Based Science, German Research Foundation, Federal Ministry of Education and Research (Germany), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)
Subjects: Physics, Paper, History, 010308 nuclear & particles physics, tetraneutron, nuclear force, proton knock-out, radioactive beams, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Computer Science Applications, Education, ddc, Nuclear physics, 0103 physical sciences, Tetraneutron, Neutron, ddc:530, 010306 general physics
Abstract: 7 pags., 3 figs. -- 27th International Nuclear Physics Conference (INPC2019), The tetraneutron has attracted the attention of nuclear physicists during the past decades, but there is still no unambiguous confirmation of its existence or nonexistence. A new experiment based on 8 He(p,2p)7H{t+4n} reaction, with direct detection of the four neutrons, has been carried out at RIBF, which can hopefully help to draw a definite conclusion on the tetraneutron system., We acknowledge the support of the RIBF accelerator staff and the BigRIPS team for providing the high-quality beam. Z. H. Yang acknowledges the financial support from the Foreign Postdoctoral Researcher program of RIKEN. T. Aumann acknowledges the support by DFG via SFB 1245. P. Koseoglou acknowledges the support from BMBF (NUSTAR.DA grant No.05P 15RDFN1).
Published: 2020
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13. How Different is the Core of 25F from 24Og.s. ?

Author: T., L. Tang (Univ. Tokyo, CNS), T., Uesaka (RIKEN), S., Kawase (Univ. Tokyo, CNS), D., Beaumel (Inst. Phys. Nucl. Orsay), M., Dozono (RIKEN), T., Fujii (Univ. Tokyo CNS), N., Fukuda (RIKEN), T., Fukunaga (Kyushu Univ.), A., Galindo-Uribarri (Oak Ridge Natl. Lab.), S., H. Hwang (Kyungpook Natl. Univ.), N., Inabe (RIKEN), D., Kameda (RIKEN), T., Kawahara (Toho Univ.), W., Kim ( Kyungpook Natl. Univ. ), K., Kisamori (Univ. Tokyo, CNS), M., Kobayashi (Univ. Tokyo, CNS), T., Kubo (RIKEN), Y., Kubota (Univ. Tokyo, CNS), K., Kusaka (RIKEN), C., S. Lee (Univ. Tokyo, CNS), Y., Maeda (Univ. Miyazaki), Wakui, Takashi, al., et, Takashi, Wakui, T., L. Tang (Univ. Tokyo, CNS), T., Uesaka (RIKEN), S., Kawase (Univ. Tokyo, CNS), D., Beaumel (Inst. Phys. Nucl. Orsay), M., Dozono (RIKEN), T., Fujii (Univ. Tokyo CNS), N., Fukuda (RIKEN), T., Fukunaga (Kyushu Univ.), A., Galindo-Uribarri (Oak Ridge Natl. Lab.), S., H. Hwang (Kyungpook Natl. Univ.), N., Inabe (RIKEN), D., Kameda (RIKEN), T., Kawahara (Toho Univ.), W., Kim ( Kyungpook Natl. Univ. ), K., Kisamori (Univ. Tokyo, CNS), M., Kobayashi (Univ. Tokyo, CNS), T., Kubo (RIKEN), Y., Kubota (Univ. Tokyo, CNS), K., Kusaka (RIKEN), C., S. Lee (Univ. Tokyo, CNS), Y., Maeda (Univ. Miyazaki), Wakui, Takashi, al., et, and Takashi, Wakui
Abstract: The structure of a neutron-rich F-25 nucleus is investigated by a quasifree (p, 2p) knockout reaction at 270A MeV in inverse kinematics. The sum of spectroscopic factors of pi 0d(5/2) orbital is found to be 1.0 +/- 0.3. However, the spectroscopic factor with residual O-24 nucleus being in the ground state is found to be only 0.36 +/- 0.13, while those in the excited state is 0.65 +/- 0.25. The result shows that the O-24 core of F-25 nucleus significantly differs from a free O-24 nucleus, and the core consists of similar to 35% O-24(g.s.). and similar to 65% excited O-24. The result may infer that the addition of the 0d(5/2) proton considerably changes neutron structure in F-25 from that in O-24, which could be a possible mechanism responsible for the oxygen dripline anomaly.
Published: 2020

14. Study of multi-neutron systems with SAMURAI spectrometer

Author: K. Yoneda, Z. Elekes, Masaki Sasano, Heiko Scheit, Atsumi Saito, N. Inabe, I. Stefan, J. Tscheuschner, Mohsen Harakeh, Julien Gibelin, M. A. Knösel, K. Boretzky, Z. Ge, Takashi Nakamura, D. Kim, H. Sato, J. Kahlbow, Igor Gašparić, Y. Yasuda, Susumu Shimoura, T. Isobe, Juzo Zenihiro, M. Caamaño, Yosuke Kondo, S. Masuoka, H. Suzuki, A. Hirayama, S. W. Huang, C. A. Douma, B. M. Godoy, Z. Halász, H. Yamada, C. Lehr, M. Böhmer, Nobuyuki Chiga, A. Revel, N. L. Achouri, P. Koseoglou, Kathrin Wimmer, V. Wagner, N. A. Orr, M. Potlog, M. Miwa, B. Yang, A. Obertelli, T. Harada, H. T. Törnqvsit, S. Reichert, H. Miki, D. S. Ahn, T. Tomai, István Kuti, J. Mayer, J. Tanaka, S. Park, Yasuhiro Togano, M. Parlog, Naoki Fukuda, Yu-xin Liu, S. Chen, V. Panin, L. Zanetti, F. Schindler, S. Storck, T. Shimada, Tomohiro Uesaka, J. Feng, M. Matsumoto, Zaihong Yang, U. Forsberg, Roman Gernhäuser, I. Murray, F. Dufter, D. Symochko, L. Stuhl, J. M. Gheller, Hideaki Otsu, D. Beaumel, T. Kobayashi, H. Takeda, A. Gillibert, D. Cortina, P. Doornenbal, L. Yang, Nasser Kalantar-Nayestanaki, Satoshi Takeuchi, Thomas Aumann, Stefanos Paschalis, T. Fujino, D. M. Rossi, H. Baba, Yohei Shimizu, M. L. Cortés, F. M. Marqués, B. Fernández-Domínguez, Yuya Kubota, Yukie Maeda, S. K. Kim, P. J. Li, Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)
Subjects: Physics, Firm conclusion, Spectrometer, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 010305 fluids & plasmas, Nuclear physics, 0103 physical sciences, Tetraneutron, Neutron, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment
Abstract: The tetraneutron has been drawing the attention of the nuclear physics community for decades, but a firm conclusion on its existence and properties is still far from being reached despite many experimental and theoretical efforts. New measurements have recently been performed at RIBF with the SAMURAI spectrometer by applying complementary reaction probes, which will help to pin down the properties of this four-neutron system., Comment: 5 pages, 2 figures, conference proceedings of XXII International Conference on Few-Body Problems in Physics (FB22), Caen, France, July 2018
Published: 2018
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15. Experimental Study of the ${^{30}}{\text {P}({\text {p}}}{,}{\gamma })^{31}\text {S}$ Reaction in Classical Novae

Author: A. Georgiadou, A. Gottardo, Alison Laird, N. Oulebsir, Á. M. Sánchez Benítez, F. Flavigny, J. Kiener, A. Coc, F. de Oliveira, J. Riley, D. Beaumel, M. MacCormick, L. Olivier, J. Guillot, L. Grassi, I. Matea, N. Hubbard, Giuseppe D’Agata, C. Delafosse, K. Béroff, Valdir Guimaraes, L. Perrot, S. P. Fox, P. Adsley, N. de Séréville, C. Portail, F. Hammache, A. Meyer, Anuj Parikh, Alessandro Luiz Lara, V. Tatischeff, M. Assié, T. Id Barkach, Marlete Assunção, I. Stefan, B. Bastin, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut des Sciences Moléculaires d'Orsay (ISMO), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)
Subjects: Physics, Reaction rate, Particle physics, 010308 nuclear & particles physics, 0103 physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 010306 general physics, 01 natural sciences, 7. Clean energy
Abstract: International audience; The$^{30}$ P(p, $\gamma $ )$^{31}$ S reaction is one of the few remaining reactions whose rate uncertainty has a strong impact on classical novae model predictions. To reduce the nuclear uncertainties associated to this reaction, we measured the$^{31}$ P($^{3}$ He,t)$^{31}$ S reaction at the ALTO facility. Simultaneous detection of the triton and proton decays from the populated resonances will provide the proton branching ratios. The astrophysical context of this work, the current situation of the$^{30}$ P(p, $\gamma $ )$^{31}$ S reaction rate, the experimental set-up and the analysis of the single and coincidence events will be presented.
Published: 2018
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16. Charged-particle decays of highly excited states in $^{19}$F

Author: I. Stefan, I. Sivacek, Marin Chabot, Jérôme Guillot, A. Gottardo, M. Assié, C. Delafosse, A. Georgiadou, J. Riley, Vincent Tatischeff, L. Perrot, Alison Laird, D. Beaumel, I. Matea, F. Flavigny, Valdir Guimaraes, P. Adsley, Jürgen Kiener, S. P. Fox, R. Garg, M. Degerlier, A. Lefebvre-Schuhl, N. de Sereville, L. Olivier, S. Gillespie, Fairouz Hammache, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)
Subjects: Physics, 010308 nuclear & particles physics, Order (ring theory), FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Charged particle, Supernova, Excited state, 0103 physical sciences, Production (computer science), Neutron, Atomic physics, Nuclear Experiment (nucl-ex), Nuclear Experiment, 010303 astronomy & astrophysics
Abstract: Neutron-capture reactions on $^{18}$F in the helium-burning shell play an important role in the production of $^{15}$N during core-collapse supernovae. The competition between the $^{18}$F($n,p/\alpha$)$^{18}$O/$^{15}$N reactions controls the amount of $^{15}$N produced. The strengths of these reactions depend on the decay branching ratios of states in $^{19}$F above the neutron threshold. We report on an experiment investigating the decay branching ratios of these states in order to better constrain the strengths of the reactions., Comment: Submitted as part of the Proceedings of NIC 2018
Published: 2018
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17. Solid hydrogen target for missing mass spectroscopy in inverse kinematics

Author: Yohei Matsuda, Juzo Zenihiro, Zhengyang Tian, Harutaka Sakaguchi, Nori Aoi, S. Kawakami, Satoru Terashima, Yukie Maeda, Takahiro Kawabata, M. Tsumura, D. Beaumel, Tetsuya Yamamoto, S. Gotanda, and Hideaki Otsu
Subjects: Radioactive ion beams, Elastic scattering, Inverse kinematics, Chemistry, Health, Toxicology and Mutagenesis, Public Health, Environmental and Occupational Health, Mechanical press, Mass spectrometry, Spin isomers of hydrogen, Pollution, Analytical Chemistry, Neodymium magnet, Nuclear Energy and Engineering, Solid hydrogen, Radiology, Nuclear Medicine and imaging, Atomic physics, Spectroscopy
Abstract: By using para-hydrogen and a mechanical press made of neodymium magnets, we have succeeded in making a 1-mm-thick and 30-mm-diameter solid hydrogen target (SHT), and have measured elastic scattering of protons with radioactive ion beams at 300 MeV/u. We also succeeded in making not only a 0.5-mm-thick and 10-mm-diameter SHT but also a 2-mm-thick and 30-mm-diameter SHT to study excited-state properties of nuclei via (p,p′) reactions, and quasi-free (p,pα) reactions at intermediate energies. The ortho–para converter and the simple mechanical press show possibilities for making SHTs which have various radii and thicknesses.
Published: 2015
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18. Study of key resonances in the $^{30}$P(p,γ)$^{31}$S reaction in classical novae

Author: F. Flavigny, L. Olivier, A. Alellara, B. Bastin, L. Perrot, J. Riley, L. Grassi, F. de Oliveira, T. Id Barkach, J. Guillot, Alison Laird, J. Kiener, Á. M. Sánchez Benítez, D. Beaumel, V. Tatischeff, Marlete Assunção, Anuj Parikh, S. P. Fox, A. Meyer, P. Adsley, Giuseppe D’Agata, C. Portail, A. Gottardo, F. Hammache, I. Matea, M. Assié, N. Oulebsir, A. Georgiadou, C. Delafosse, M. MacCormick, N. Hubbard, Valdir Guimaraes, A. Coc, N. de Séréville, I. Stefan, K. Béroff, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut des Sciences Moléculaires d'Orsay (ISMO), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)
Subjects: Physics, Proton, 010308 nuclear & particles physics, QC1-999, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Coincidence, Nuclear physics, Reaction rate, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, Excited state, 0103 physical sciences, 010303 astronomy & astrophysics
Abstract: Among reactions with strong impact on classical novae model predictions, 30P(p,γ)31S is one of the few remained that are worthy to be measured accurately, because of their rate uncertainty, as like as 18F(p,α)15O and 25Al(pγ)26Si. To reduce the nuclear uncertainties associated to this reaction, we performed an experiment at ALTO facility of Orsay using the 31P(3He,t)31S reaction to populate 31S excited states of astrophysical interest and detect in coincidence the protons coming from the decay of the populated states in order to extract the proton branching ratios. After a presentation of the astrophysical context of this work, the current situation of the 30P(p,γ)31S reaction rate will be discussed. Then the experiment set-up of this work and the analysis of the single events will be presented.
Published: 2017
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19. Spectroscopy of Fe61 via the neutron transfer reaction H2(Fe60,p)Fe*61

Author: S. Giron, F. Hammache, N. de Séréville, P. Roussel, J. Burgunder, M. Moukaddam, D. Beaumel, L. Caceres, G. Duchêne, E. Clément, B. Fernandez-Dominguez, F. Flavigny, G. de France, S. Franchoo, D. Galaviz-Redondo, L. Gasques, J. Gibelin, A. Gillibert, S. Grevy, J. Guillot, M. Heil, J. Kiener, V. Lapoux, F. Maréchal, A. Matta, I. Matea, L. Nalpas, J. Pancin, L. Perrot, A. Obertelli, R. Raabe, J. A. Scarpaci, K. Sieja, O. Sorlin, I. Stefan, C. Stodel, M. Takechi, J. C. Thomas, and Y. Togano
Subjects: Physics, Photon, Silicon, 010308 nuclear & particles physics, chemistry.chemical_element, 01 natural sciences, 7. Clean energy, Charged particle, Cross section (physics), chemistry, 0103 physical sciences, Bound state, Neutron, Atomic physics, 010306 general physics, Adiabatic process, Spectroscopy
Abstract: The direct component of the 60Fe(n,γ)61Fe cross section was investigated by populating the bound states of the 61Fe nucleus through the (d,pγ) transfer reaction in inverse kinematics using a radioactive beam of 60Fe at 27A MeV. The experiment was performed at GANIL using the MUST2 array and an annular double-sided silicon strip detector for the detection of the light charged particle in coincidence with the photons measured in the EXOGAM γ-ray detectors. For the first time, the spectroscopic factors of the first 3/2−, 5/2−, 1/2−, and 9/2+ states of 61Fe were deduced experimentally from an adiabatic distorted wave approximation analysis of the data. The obtained results show a very good agreement with the shell-model predictions. The calculated direct component of the (n,γ) cross section was found negligible and of about 2% of the total, indicating a dominant resonant component.
Published: 2017
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20. Candidate Resonant Tetraneutron State Populated by theHe4(He8,Be8)Reaction

Author: C. S. Lee, Shintaro Go, H. Baba, N. Fukuda, Daisuke Kameda, F. Hammache, Motonobu Takaki, Yukie Maeda, M. Itoh, Shumpei Noji, Rin Yokoyama, Yuya Kubota, Kentaro Yako, H. Sato, Yosuke Kondo, M. Assie, D. Beaumel, Michikazu Kobayashi, Yohei Shimizu, H. Sakai, Hiroyuki Takeda, Takeo Kawabata, K. Miki, Yoshiko Sasamoto, Toshiyuki Kubo, Shoichiro Kawase, Masaki Sasano, Teruo Fujii, Susumu Shimoura, T. Nishi, Shin'ichiro Michimasa, Tomohiro Uesaka, Hiroshi Tokieda, L. Tang, Satoshi Takeuchi, Atsushi Tamii, Satoshi Sakaguchi, Eiji Ideguchi, Y. Yanagisawa, T. Baba, M. Tsumura, Hiroyuki Miya, K. Kisamori, Hiroaki Matsubara, Andreas Stolz, K. Yoshida, Shuichi Ota, Masanori Dozono, Naohito Inabe, H. Suzuki, and M. Kurata-Nishimura
Subjects: Physics, 010308 nuclear & particles physics, Q value, Spectrum (functional analysis), General Physics and Astronomy, State (functional analysis), 01 natural sciences, 7. Clean energy, Nuclear physics, 0103 physical sciences, Tetraneutron, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Energy (signal processing)
Abstract: A candidate resonant tetraneutron state is found in the missing-mass spectrum obtained in the double-charge-exchange reaction ^{4}He(^{8}He,^{8}Be) at 186 MeV/u. The energy of the state is 0.83±0.65(stat)±1.25(syst) MeV above the threshold of four-neutron decay with a significance level of 4.9σ. Utilizing the large positive Q value of the (^{8}He,^{8}Be) reaction, an almost recoilless condition of the four-neutron system was achieved so as to obtain a weakly interacting four-neutron system efficiently.
Published: 2016
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21. Identification of light particles by means of pulse shape analysis with silicon detector at low energy

Author: V. V. Parkar, Ismael Martel, J.A. Dueñas, M. Assié, R. Berjillos, A. M. Sánchez-Benítez, D. Beaumel, D. Mengoni, Institut de Physique Nucléaire d'Orsay (IPNO), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, Nuclear reaction, Nuclear and High Energy Physics, Photon, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Preamplifier, business.industry, Doping, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Particle identification, Charged particle, Optics, 0103 physical sciences, Physics::Accelerator Physics, Neutron, Nuclear Experiment, 010306 general physics, business, Instrumentation, Beam (structure)
Abstract: Particle separation of 1,2,3H at energy of 3 MeV has been achieved by digital pule shape analysis (DPSA) for particles fully stopped in a 500 μ m silicon detector. Light charged particles were produced in a nuclear reaction induced by a 34 MeV beam of 7Li impinging on a 12C target. Proton–deuterium identification has also been observed at 2 MeV using mono-energetic beams. A 20 keV resolution neutron transmutation doped (NTD) silicon detector was employed in a low-field injection setup. The method uses the parameters obtained both from the charge and current pulses generated by a high bandwidth charge sensitive preamplifier. The simplicity of the electronic chain plus the experimental conditions allowed the team to work with very low noise achieving signal-to-noise ratio (SNR) at values greater than 10.
Published: 2012
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22. PROBING PRE-FORMED ALPHA PARTICLES IN THE GROUND STATE OF NUCLEI

Author: J. A. Scarpaci, M. Fallot, Denis Lacroix, J.L. Laville, A. Chbihi, D. Beaumel, J.D. Frankland, E. Plagnol, Ph. Chomaz, J.C. Roynette, P. Roussel-Chomaz, M. Assié, P. Désesquelle, Y. Blumenfeld, C. Bhar, T. Zerguerras, H. Idbarkach, Elias Khan, A. Shrivastava, E. C. Pollacco, N. Frascaria, L. Lefebvre, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), CSNSM SNO, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Département d'Electronique, des Détecteurs et d'Informatique pour la Physique (ex SEDI) (DEDIP), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire SUBATECH Nantes (SUBATECH), Mines Nantes (Mines Nantes)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, APC - Cosmologie, Physique Corpusculaire et Cosmologie - Collège de France (PCC), Collège de France (CdF)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Collège de France (CdF)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-AstroParticule et Cosmologie (APC (UMR_7164)), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7), CEA/DSM Centre de Saclay (CEA/DSM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Nantes (UN)-Mines Nantes (Mines Nantes), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), AstroParticule et Cosmologie (APC (UMR_7164)), Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, Nuclear and High Energy Physics, Nuclear Theory, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], 010308 nuclear & particles physics, FOS: Physical sciences, General Physics and Astronomy, Alpha particle, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Nuclear Theory (nucl-th), Angular distribution, medicine.anatomical_structure, Helium-4, 0103 physical sciences, medicine, Alpha decay, Nuclear Experiment (nucl-ex), Atomic physics, Nuclear Experiment, 010306 general physics, Ground state, Nucleus
Abstract: In this Letter, we report on alpha particle emission through the nuclear break-up in the reaction 40Ca on a 40Ca target at 50A MeV. It is observed that, similarly to nucleons, alpha particles can be emitted to the continuum with very specific angular distribution during the reaction. The alpha particle properties can be understood as resulting from an alpha cluster in the daughter nucleus that is perturbed by the short range nuclear attraction of the collision partner and emitted. A time-dependent theory that describe the alpha particle wave-function evolution is able to reproduce qualitatively the observed angular distribution. This mechanism offers new possibilities to study alpha particle properties in the nuclear medium., Comment: 4 pages, 3 figures
Published: 2011
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23. Pair and single neutron transfer with Borromean 8He

Author: Vladimir Zelevinsky, S. Bhattacharyya, Johan Nyberg, R. Raabe, I. Stefan, A. Navin, Roy Crawford Lemmon, N. Keeley, Cedric Simenel, D. Gupta, Y. Blumenfeld, Bertrand Jacquot, A. Shrivastava, K. Ramachandran, M. Rejmund, A. Chatterjee, J.A. Scarpaci, V. Nanal, C. N. Timis, M. Labiche, A. Lemasson, R. G. Pillay, Dominique Bazin, Christian Schmitt, D. Beaumel, Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Department of Nuclear Reactions, The Andrzej Soltan Intitute for Nuclear Studies, National Superconducting Cyclotron Laboratory, Michigan State University [East Lansing], Michigan State University System-Michigan State University System, Variable Energy Cyclotron Centre, Nuclear Physics Division, Bhabha Atomic Research Centre (BARC), Government of India, Department of Atomic Energy-Government of India, Department of Atomic Energy, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), CCLRC, Daresbury Laboratory, Department of Nuclear and Atomic Physics, Tata Institute for Fundamental Research (TIFR), Department of Physics and Astronomy [Uppsala], Uppsala University, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Department of Physics, University of Surrey (UNIS), SPIRAL, Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)
Subjects: Excitation function, Physics, Nuclear and High Energy Physics, Fusion, 010308 nuclear & particles physics, Direct observation, Transfer reaction, Borromean nucleus, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Transfer (group theory), Pairing, 0103 physical sciences, Neutron, Atomic physics, 010306 general physics
Abstract: Direct observation of the survival of 199Au residues after 2n transfer in the He 8 + Au 197 system and the absence of the corresponding 67Cu in the He 8 + Cu 65 system at various energies are reported. The measurements of the surprisingly large cross sections for 199Au, coupled with the integral cross sections for the various Au residues, is used to obtain the first model-independent lower limits on the ratio of 2n to 1n transfer cross sections from 8He to a heavy target. A comparison of the transfer cross sections for 6,8He on these targets highlights the differences in the interactions of these Borromean nuclei. These measurements for the most neutron-rich nuclei on different targets highlight the need to probe the reaction mechanism with various targets and represent an experimental advance towards understanding specific features of pairing in the dynamics of dilute nuclear systems.
Published: 2011
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24. NEUTRON CORRELATIONS IN 6<font>He</font> VIEWED THROUGH NUCLEAR BREAK-UP

Author: Denis Lacroix, M. Chabot, C. Monrozeau, J. C. Angélique, M. Assié, C. M. Petrache, A. Chatterjee, H. Iwasaki, J. A. Scarpaci, W. N. Catford, Muriel Fallot, T. Tuna, F. Maréchal, F. Skaza, Y. Blumenfeld, D. Beaumel, D. Bazin, and Johan Nyberg
Subjects: Physics, Nuclear reaction, Nuclear and High Energy Physics, Break-Up, 010308 nuclear & particles physics, General Physics and Astronomy, Astronomy and Astrophysics, 01 natural sciences, Nuclear physics, Correlation function (statistical mechanics), Mean field theory, 0103 physical sciences, Neutron, Nuclear drip line, Atomic physics, 010306 general physics, Nucleon, Beam (structure)
Abstract: Nuclear break-up as a tool to study neutron correlations is investigated both theoretically and experimentally. First a time dependent theory going beyond mean field has been developed and shows that correlations between nucleons can be probed through nuclear break-up. Secondly, nuclear break-up of 6 He on 208 Pb target was studied at 20 A.MeV using a secondary beam of 6 He produced by the SPIRAL facility at GANIL. From the correlation function, a strong contribution of the di-neutron configuration of 6 He is found.
Published: 2010
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25. Shell evolution in light nuclei inferred from transfer reactions

Author: D. Beaumel, Institut de Physique Nucléaire d'Orsay (IPNO), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, Nuclear and High Energy Physics, Light nucleus, Quenching (fluorescence), 010308 nuclear & particles physics, Nuclear Theory, Shell (structure), chemistry.chemical_element, Germanium, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Transfer (group theory), medicine.anatomical_structure, chemistry, 0103 physical sciences, medicine, Particle, Atomic physics, Nuclear Experiment, 010306 general physics, Nucleus, Excitation
Abstract: Recent results on shell evolution in light exotic nuclei obtained through experiments performed at GANIL using the MUST2 particle array are reported. The one-nucleon transfer reactions 20 O(d,t) was investigated using a setup combining the MUST2 and TIARA particle arrays, together with EXOGAM germanium detectors. Preliminary results on the populated states as well as comparison with calculated spectroscopic factors are presented. In a second study, the Z = 8 shell closure was investigated by means of the two-neutron transfer reaction 14 O(p,t) using a set of MUST2 telescopes. A newly observed state at low excitation energy in the unbound 12 O points to the Z = 8 shell quenching, analogously to the established case at N = 8 in the neutron-rich mirror nucleus 12 Be.
Published: 2010
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26. Indirect study of 19Ne states near the threshold

Author: N. de Séréville, B. Bouzid, Marc Loiselet, Jürgen Kiener, Carmen Angulo, Vincent Tatischeff, A. Coc, Michel Gaelens, P. Figuera, F. de Oliveira Santos, Guido Ryckewaert, Daniel Labar, Alain Ninane, S. Fortier, S. Ouichaoui, P. Demaret, Marlete Assunção, S. Cherubini, F. Hammache, Pierre Leleux, E. Berthoumieux, D. Beaumel, N. Smirnova, Manoel Couder, and A. Lefebvre-Schuhl
Subjects: Physics, Reaction rate, Nuclear reaction, Nuclear and High Energy Physics, Proton, 010308 nuclear & particles physics, Scattering, 0103 physical sciences, Atomic physics, 010306 general physics, 01 natural sciences, Radioactive beam
Abstract: The early E ⩽ 511 keV gamma-ray emission from novae depends critically on the F 18 ( p , α ) O 15 reaction. Unfortunately the reaction rate of the F 18 ( p , α ) O 15 reaction is still largely uncertain due to the unknown strengths of low-lying proton resonances near the F 18 + p threshold which play an important role in the nova temperature regime. We report here our last results concerning the study of the d ( F 18 , p ) F 19 ( α ) N 15 transfer reaction. We show in particular that these two low-lying resonances cannot be neglected. These results are then used to perform a careful study of the remaining uncertainties associated to the F 18 ( p , α ) O 15 and F 18 ( p , γ ) Ne 19 reaction rates.
Published: 2007
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27. Measurement of the GMR in the Unstable 56Ni Nucleus using the Active Target Maya

Author: U. Garg, A. Gillibert, N. Frascaria, M. Gelin, M. Caamaño, D. Beaumel, D. Cortina-Gil, D. Gupta, A. Obertelli, J. A. Scarpaci, C. Monrozeau, W. Mittig, Y. Blumenfeld, P. Roussel-Chomaz, F. Maréchal, Elias Khan, C. E. Demonchy, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Département Recherches Subatomiques (DRS-IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)
Subjects: Active target, Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Isoscalar, Nuclear Theory, Magnetic monopole, Resonance, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Inelastic scattering, 01 natural sciences, Nuclear physics, medicine.anatomical_structure, 0103 physical sciences, Energy spectrum, medicine, Atomic physics, Nuclear Experiment, 010303 astronomy & astrophysics, Nucleus, Excitation
Abstract: The measurement of the Isoscalar Giant Monopole Resonance(GMR) in unstable nuclei remains a major experimental challenge due to low radioactive beam intensities and unfavourable conditions in reverse kinematics. At GANIL, we have tested a new experimental method based on the unique capabilities of the active target Maya to probe the GMR by the inelastic scattering reaction 56Ni(d,d') at 50 AMeV. The preliminary excitation energy spectrum of 56Ni presents a bump between 12 and 25 MeV where isoscalar resonances are expected. © 2007 Elsevier B.V. All rights reserved.
Published: 2007
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28. Low-lying states and structure of the exotic 8He via direct reactions on the proton

Author: F. Skaza, A. Gillibert, R. Wolski, D. Beaumel, A. Drouart, J. L. Sida, K. Rusek, V. Lapoux, P. Roussel-Chomaz, A. Pakou, N. Keeley, F. Auger, Lydie Giot, J.A. Scarpaci, E. Becheva, Y. Blumenfeld, E. C. Pollacco, N. Alamanos, Elias Khan, R. Raabe, S. V. Stepantsov, F. Delaunay, L. Nalpas, Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Peter von Neumann-Cosel, Thomas Aumann, and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, Nuclear and High Energy Physics, Proton, 010308 nuclear & particles physics, Scattering, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Resonance (particle physics), Charged particle, medicine.anatomical_structure, Excited state, 0103 physical sciences, medicine, Atomic physics, Nuclear Experiment, 010306 general physics, Ground state, Nucleus, Excitation
Abstract: The structure of the light exotic nucleus 8 He was investigated using direct reactions of the 8 He SPIRAL beam on a proton-rich target. The (p,p') scattering to the 2 1 + state, the (p,d) 7 He and (p,t) 6 He transfer reactions, were measured at the energy E l a b = 15.7 A.MeV . The light charged particles (p,d,t) were detected in the MUST Si-strip telescope array. The excitation spectrum of 8 He was extracted from the (p,p') reaction. Above the known 2 1 + excited state at 3.6 MeV, a second resonance was found around 5.4 MeV. The cross sections were analyzed within the coupled-reaction channels framework, using microscopic potentials. It is inferred that the 8 He ground state has a more complex neutron-skin structure than suggested by previous α + 4 n models assuming a pure ( 1 p 3 / 2 ) 4 configuration.
Published: 2007
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29. Isoscalar response ofNi68toα-particle and deuteron probes

Author: L. Caceres, M. Caamaño, J. C. Thomas, Gianluca Colò, Marine Vandebrouck, F. Delaunay, O. Sorlin, J. Pancin, D. Beaumel, B. Fernández-Domínguez, P. Roussel-Chomaz, H. Savajols, J. Gibelin, Nasser Kalantar-Nayestanaki, D. Suzuki, N.L. Achouri, Elias Khan, C. Stodel, Riccardo Raabe, T. Roger, W. Mittig, Mohsen Harakeh, Hidetada Baba, U. Garg, G. F. Grinyer, N. Keeley, and Y. Blumenfeld
Subjects: Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Scattering, Isoscalar, Nuclear Theory, Magnetic monopole, Resonance, Alpha particle, 01 natural sciences, Nuclear physics, Dipole, Deuterium, 0103 physical sciences, Quadrupole, Atomic physics, Nuclear Experiment, 010306 general physics, Astrophysics::Galaxy Astrophysics
Abstract: Isoscalar giant resonances have been measured in the unstable Ni68 nucleus using inelastic alpha and deuteron scattering at 50A MeV in inverse kinematics with the active target MAYA at GANIL. Using alpha scattering, the extracted isoscalar giant monopole resonance (ISGMR) centroid was determined to be 21.1±1.9 MeV and the isoscalar giant quadrupole resonance (ISGQR) to be 15.9±1.3 MeV. Indications for soft isoscalar monopole and dipole modes are provided. Results obtained with both (α,α′) and (d,d′) probes are compatible. The evolution of isoscalar giant resonances along the Ni isotopic chain from Ni56 to Ni68 is discussed.
Published: 2015
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30. Candidate Resonant Tetraneutron State Populated by the ^{4}He(^{8}He,^{8}Be) Reaction

Author: K, Kisamori, S, Shimoura, H, Miya, S, Michimasa, S, Ota, M, Assie, H, Baba, T, Baba, D, Beaumel, M, Dozono, T, Fujii, N, Fukuda, S, Go, F, Hammache, E, Ideguchi, N, Inabe, M, Itoh, D, Kameda, S, Kawase, T, Kawabata, M, Kobayashi, Y, Kondo, T, Kubo, Y, Kubota, M, Kurata-Nishimura, C S, Lee, Y, Maeda, H, Matsubara, K, Miki, T, Nishi, S, Noji, S, Sakaguchi, H, Sakai, Y, Sasamoto, M, Sasano, H, Sato, Y, Shimizu, A, Stolz, H, Suzuki, M, Takaki, H, Takeda, S, Takeuchi, A, Tamii, L, Tang, H, Tokieda, M, Tsumura, T, Uesaka, K, Yako, Y, Yanagisawa, R, Yokoyama, and K, Yoshida
Abstract: A candidate resonant tetraneutron state is found in the missing-mass spectrum obtained in the double-charge-exchange reaction ^{4}He(^{8}He,^{8}Be) at 186 MeV/u. The energy of the state is 0.83±0.65(stat)±1.25(syst) MeV above the threshold of four-neutron decay with a significance level of 4.9σ. Utilizing the large positive Q value of the (^{8}He,^{8}Be) reaction, an almost recoilless condition of the four-neutron system was achieved so as to obtain a weakly interacting four-neutron system efficiently.
Published: 2015

31. First test experiment to produce the slowed-down RI beam with the momentum-compression mode at RIBF

Author: D. S. Ahn, Eiji Ideguchi, Takashi Teranishi, Toshiyuki Sumikama, Naoki Fukuda, Toshio Kobayashi, D. Beaumel, Hiroshi Suzuki, Yuji Shimizu, Toshiyuki Kubo, K. Hasegawa, N. Imai, Hideaki Otsu, Shin'ichiro Michimasa, Susumu Shimoura, Masafumi Matsushita, Nori Aoi, Hiroyuki Takeda, Naohito Inabe, Institut de Physique Nucléaire d'Orsay (IPNO), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Nuclear and High Energy Physics, 010308 nuclear & particles physics, Chemistry, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Nuclear physics, Beam size, Nuclear fission, 0103 physical sciences, Physics::Accelerator Physics, Atomic physics, 010306 general physics, Nuclear Experiment, Instrumentation
Abstract: International audience; The 82Ge beam has been produced by the in-flight fission reaction of the 238U primary beam with 345 MeV/u at the RIKEN RI beam factory, and slowed down to about 15 MeV/u using the energy degraders. The momentum-compression mode was applied to the second stage of the BigRIPS separator to reduce the momentum spread. The energy was successfully reduced down to 13 ± 2.5 MeV/u as expected. The focus was not optimized at the end of the second stage, therefore the beam size was larger than the expectation. The transmission of the second stage was half of the simulated value mainly due to out of focus. The two-stage separation worked very well for the slowed-down beam with the momentum-compression mode.
Published: 2015
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32. Study of the N = 28 shell closure in the Ar isotopic chain

Author: E. Rich, Zsolt Dombrádi, D. Sohler, L. Nalpas, Karl Kratz, Yu. E. Penionzhkevich, J. Gibelin, F. Hammache, S. Franchoo, J.A. Scarpaci, M. Gelin, D. Beaumel, K. W. Kemper, E. C. Pollacco, S. Grévy, S. Fortier, M. Stanoiu, Thomas Rauscher, M. G. St. Laurent, Y. Blumenfeld, F. Nowacki, P. Roussel-Chomaz, O. Sorlin, A. N. Ostrowski, L. Gaudefroy, Erik Tryggestad, S. M. Lukyanov, D. Verney, F. Ibrahim, C. Monrozeau, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), SPIRAL, Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Nuclear and High Energy Physics, Nuclear Theory, Hadron, 21.10.Hw, 21.10.Jx, 25.60.Je, 26.30.+k, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Reaction rate, Spin, Transfer reactions, Atomic orbital, 0103 physical sciences, Nuclear astrophysics, medicine, Astrophysics::Solar and Stellar Astrophysics, Nuclear fusion, Neutron, Nuclear Experiment, 010306 general physics, Physics, 010308 nuclear & particles physics, Nucleosynthesis in novae, and isobaric spin, Neutron capture, medicine.anatomical_structure, parity, Physics::Space Physics, Spectroscopic factors, Atomic physics, supernovae and other explosive environments, Nucleus
Abstract: Expérience au GANIL NESTER; The structure of the neutron-rich nucleus $^{47}$Ar has been investigated through the d( $^{46}$Ar, $^{47}$Ar)p transfer reaction. The radioactive beam of $^{46}$Ar at 10A·MeV was provided by the SPIRAL facility at GANIL. The protons corresponding to a neutron pick-up on bound or unbound states mechanism in $^{47}$Ar nuclei were detected at backward angles by the position-sensitive Si array-detector MUST. The transfer-like ejectiles were detected in the SPEG spectrometer. Level scheme, spin assignments and spectroscopic factors have been deduced for $^{47}$Ar and compared to shell model predictions. They suggest a slight erosion of the N = 28 shell gap from the weakening of the spin-orbit interaction arising from the f and p orbitals. These spectroscopic information are subsequently used to infer (n,$\gamma$) reaction rates in the Ar isotopic chain to understand the origin of the $^{48}$Ca/ $^{46}$Ca abnormal isotopic ratio observed in certain inclusions of meteorites.
Published: 2006
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33. Investigation of Isovector Excitations via the (t,3He) reaction at on 58Ni and 48Ca targets: microscopic interpretation

Author: M. de Huu, Gianluca Colò, H.J. Wörtche, D. Frekers, E. Rich, B. C. Junk, Sydney Gales, P. Haefner, M. Fujiwara, D. Beaumel, Sijtze Brandenburg, Mohsen Harakeh, M.D. Hunyadi, N. Van Giai, Jérôme Guillot, Barry Davids, C. Bäumer, A.M. van den Berg, S. Fortier, S.Y. van der Werf, and E.-W. Grewe
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Thesaurus (information retrieval), Isovector, 010308 nuclear & particles physics, 0103 physical sciences, 010306 general physics, 01 natural sciences, Interpretation (model theory)
Published: 2005
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34. Analysis of the 11B(7Li,7Be)11Be reaction at 57 MeV in a microscopic approach

Author: Francesco Cappuzzello, H. Lenske, Js Winfield, A. Cunsolo, A. Foti, S. Fortier, Sea Orrigo, D. Beaumel, A. Lazzaro, and C. Nociforo
Subjects: Nuclear reaction, Physics, Nuclear and High Energy Physics, Isovector, 010308 nuclear & particles physics, Nuclear Theory, 01 natural sciences, Dipole, Excited state, 0103 physical sciences, Neutron, Born approximation, Atomic physics, Nuclear Experiment, 010306 general physics, Random phase approximation, Ground state
Abstract: The 11B(7Li, 7Be)11Be charge exchange reaction has been studied at an incident energy of 57 MeV. Spectra were measured at forward angles, θcm⩽35°. The good energy resolution (∼50 keV) allowed the identification of transitions both to the 7Be (3/2−, gs) and 7Be(1/2−, 429 keV) exit channels and hence the direct measurement of the ratio of the respective cross sections and angular distributions. Besides the bound ground and first excited state of 11Be several low lying excitations just above the neutron threshold are observed. A structure seen at E ∗ =9.4 MeV with FWHM ∼7 MeV is compatible with the spin dipole resonance (SDR). The data are analysed in a many-body approach. For the projectile transitions shell model results are used. In order to account properly for the special features of the weakly bound 11Be system the target transitions are described microscopically by Hartree–Fock–Bogoliubov (HFB) and quasi-particle random phase approximation (QRPA) theory. The HFB ground state densities and the QRPA transition densities, respectively, are used in folding calculations for the optical potentials and transition form factors. Spectra and β-decay transitions strengths are reasonably well described. The measured cross section are well reproduced by one-step direct charge exchange distorted wave born approximation (DWBA) calculations. A dominance of unnatural parity transitions is found. This is explained in terms of the spin transfer behaviour of the nucleon–nucleon isovector interaction at low bombarding energy.
Published: 2004
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35. Excited states of 15 C

Author: A. Lazzaro, D. Beaumel, S. Fortier, Francesco Cappuzzello, S. E. A. Orrigo, H. Lenske, J. S. Winfield, A. Cunsolo, C. Nociforo, A. Foti, and M. C. Allia
Subjects: Physics, Excited state, Resolution (electron density), Energy spectrum, General Physics and Astronomy, Level structure, Incident energy, Atomic physics, Nuclear Experiment, Ground state, Excitation
Abstract: The 15N(7Li,7Be)15C reaction at 55 MeV incident energy was studied at forward angles in order to explore the 15C excitation energy spectrum. The 15C ground state and the states at Ex = 0.77, 6.77, 7.30, 8.50 MeV excitation energies were populated. The energy resolution ( ~ 250 keV) allowed the identification of these transitions each for 7Be ground and first-excited state at Ex = 0.429 MeV. QRPA calculations reproduce the 15C level structure below 1.5 MeV excitation energy. The strength observed at higher excitation energies probably arises from core-excited components of 15C.
Published: 2004
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36. Evolution of single-particle strength in neutron-rich 71Cu

Author: C. Louchart, G. Marquínez-Durán, P. Morfouace, M. Assié, S. Franchoo, S. Boissinot, D. Beaumel, F. Azaiez, D. Mengoni, J. A. Scarpaci, D. R. Napoli, R. Borcea, Zsolt Dombrádi, Kamila Sieja, L. Lefebvre, A. Matta, Zs. Vajta, F. Recchia, A. Lepailleur, C. Stodel, M. Niikura, Ismael Martel, N. de Séréville, G. Burgunder, B. Fernández-Domínguez, L. Caceres, O. Sorlin, I. Stefan, O. Kamalou, A. M. Sánchez-Benítez, S. Grévy, L. Nalpas, J. Elseviers, A. Gillibert, V. Lapoux, I. Matea, C. Borcea, Fairouz Hammache, M. Stanoiu, Dóra Sohler, J. C. Thomas, S. Giron, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Universidade de Santiago de Compostela [Spain] (USC ), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), GANILEXP, Universidade de Santiago de Compostela. Departamento de Física de Partículas, Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, Nuclear and High Energy Physics, Proton, Fizikai tudományok, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, lcsh:QC1-999, Nuclear physics, Cross section (physics), Distribution (mathematics), Atomic orbital, Természettudományok, Particle, Neutron, Atomic physics, Born approximation, Nuclear Experiment, Radioactive beam, lcsh:Physics
Abstract: The strength functions of the πf5/2πf5/2, πp3/2πp3/2 and πf7/2πf7/2 orbitals in neutron-rich 71Cu were obtained in a 72Zn(d,3He)71Cu proton pick-up reaction in inverse kinematics using a radioactive beam of 72Zn at 38 MeV/u. A dedicated set-up was developed to overcome the experimental challenges posed by the low cross section of the reaction and the low energy of the outgoing 3He particles. The excitation-energy spectrum was reconstructed and spectroscopic factors were obtained after analysis of the angular distributions with the finite-range Distorted-Wave Born Approximation (DWBA). The results show that unlike for the πf5/2πf5/2 orbital and contrary to earlier interpretation, the πf7/2πf7/2 single-particle strength distribution is not appreciably affected by the addition of neutrons beyond N=40N=40., The authors are thankful to the Ganil accelerator staff, informatics service and to the IPN design office. We are grateful for the grant of the Romanian National Authority for Scientific Research, CNCS - UEFISCDI, project number PN-II-ID-PCE-2011-3-048, to the grant FPA2010-22131-C02-01 from the Spanish government and to the OTKA contract No. K100835.
Published: 2015
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37. Characterization of light particles (Z ≤ 2) discrimination performances by pulse shape analysis techniques with high-granularity silicon detector

Author: A. Jallat, Y. Blumenfeld, E. Rauly, A. S. Torrento, J.-J. Dormard, M. Assié, J.A. Dueñas, J. Guillot, V. Le Ven, T. Faul, Ismael Martel, N. de Séréville, D. Suzuki, D. Mengoni, B. Genolini, B. Le Crom, S. Ancelin, Marin Chabot, D. Beaumel, Institut de Physique Nucléaire d'Orsay (IPNO), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, business.industry, Detector, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Threshold energy, 01 natural sciences, Signal, Noise (electronics), Particle detector, Semiconductor detector, Optics, Amplitude, 0103 physical sciences, 010306 general physics, business, Energy (signal processing)
Abstract: Pulse shape analysis for light particles ( $Z \leq 2$ ) is studied in a 500 μm thick Double-Sided Stripped Silicon Detector (DSSSD) of nTD type with a pitch lower than 500 μm. Good separation between the $Z = 1$ isotopes is achieved irrespective of the side used for signal pick up with the detector biased at depletion voltage. The low energy threshold for discrimination between $Z = 1$ isotopes is found to be around 2.5 MeV at depletion voltage and the quality of the separation can be slightly improved by using filtering methods. On the other hand, the discrimination performances are enhanced when lowering the bias of the detector at the expense of energy resolution. At nominal bias (i.e. overdepletion) where the energy resolution is the best, no separation between the three hydrogen isotopes is achieved when using the amplitude of the current signal. Discrimination can still be obtained by acquiring the time over a threshold set at 10% of the amplitude after applying a square bipolar filter to the current signal. Besides, in view of the design of the front-end electronics, the effect of the sampling rate needed for pulse shape analysis has been investigated and shows that below 200 MSa/s, the discrimination quality is strongly reduced.
Published: 2015
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38. Measurement of the Isoscalar Monopole Response in the Neutron-Rich NucleusNi68

Author: Marine Vandebrouck, C. Stodel, Gianluca Colò, U. Garg, D. Suzuki, Julien Gibelin, H. Baba, Elias Khan, O. Sorlin, B. Fernández-Domínguez, Y. Blumenfeld, W. Mittig, Franck Delaunay, J. C. Thomas, N. L. Achouri, Riccardo Raabe, N. Keeley, H. Savajols, P. Roussel-Chomaz, T. Roger, D. Beaumel, Nasser Kalantar-Nayestanaki, M. Caamaño, Mohsen Harakeh, G. F. Grinyer, J. Pancin, and L. Caceres
Subjects: Physics, 010308 nuclear & particles physics, Scattering, Isoscalar, Nuclear Theory, Magnetic monopole, General Physics and Astronomy, Soft modes, 01 natural sciences, Resonance (particle physics), Nuclear physics, Cross section (physics), medicine.anatomical_structure, 0103 physical sciences, medicine, Neutron, Atomic physics, Nuclear Experiment, 010306 general physics, Nucleus
Abstract: The isoscalar monopole response has been measured in the unstable nucleus (68)Ni using inelastic alpha scattering at 50A MeV in inverse kinematics with the active target MAYA at GANIL. The isoscalar giant monopole resonance (ISGMR) centroid was determined to be 21.1 ± 1.9 MeV and indications for a soft monopole mode are provided for the first time at 12.9 ± 1.0 MeV. Analysis of the corresponding angular distributions using distorted-wave-born approximation with random-phase approximation transition densities indicates that the L = 0 multipolarity dominates the cross section for the ISGMR and significantly contributes to the low-energy mode. The L=0 part of this low-energy mode, the soft monopole mode, is dominated by neutron excitations. This demonstrates the relevance of inelastic alpha scattering in inverse kinematics in order to probe both the ISGMR and isoscalar soft modes in neutron-rich nuclei.
Published: 2014
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39. Determination of the astrophysical S factor of the 8B(p,γ)9C capture reaction from the d(8B,9C)n reaction

Author: D. Beaumel, H. Laurent, H. Ohnuma, H. Kumagai, Hiroyoshi Sakurai, T. Motobayashi, S. Fortier, Naoki Fukuda, Kenichiro Yoneda, Hironori Iwasaki, M. Ishihara, J.M. Maison, M. Hirai, Takashi Nakamura, S. M. Lukyanov, S. Pita, T. Kubo, Nori Aoi, N. Imai, Alberto Mengoni, and Toshiharu Teranishi
Subjects: Physics, Nuclear and High Energy Physics, S-factor, Atomic physics
Abstract: The asymptotic normalization coefficients for the virtual decay 9 C → 8 B + p have been determined by measuring the crosssection of the 8 B(d, n) 9 C reaction in inverse kinematics at 14.4 MeV/u, using the RIPS facility. The deduced astrophysical S factor S18 of the 8 B(p ,γ ) 9 C capture reaction in the center of mass energy range 1–100 keV is S18 = 45 ± 13 eV b.  2001
Published: 2001
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40. Test of the ANC method via (d,p) reaction

Author: H. Ohnuma, D. Beaumel, Meiko Kurokawa, M. Ishihara, Shin'ichiro Michimasa, Toshiyuki Kubo, Nori Aoi, Toshiharu Teranishi, Shigeru Kubono, S. Kato, K. Abe, Patrick Strasser, X. Liu, Alberto Mengoni, N. Imai, Hiroyoshi Sakurai, Kazukiyo Kumagai, Institut de Physique Nucléaire d'Orsay (IPNO), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, 0103 physical sciences, Particle Physics - Lattice, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 010306 general physics, 01 natural sciences, Simulation, Test (assessment)
Published: 2001
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41. Light particles emitted with very forward quasi-projectiles in the fragmentation of 44 MeV amu-140Ar on27Al,58,64Ni, and197Au

Author: E. Kashy, F. Clapier, M. Bernas, C. Stephan, M. Mirea, L. Tassan-Got, Ch.O. Bacri, D Beaumel, V. Borrel, and P. Roussel
Subjects: Physics, Nuclear and High Energy Physics, Photon, Fragmentation (mass spectrometry), Proton, Coincident, Projectile, Incident beam, Neutron, Atomic physics, Nuclear Experiment, Coincidence
Abstract: A first measurement is reported on coincident fast protons and neutrons evaporated by fragments detected in the incident beam direction. For all targets, the proton coincidence ratio is shown to increase with fragment velocity loss. This increase is correlated to the decrease of the fragment yield, with the coincidence ratio doubling when the yield decreases by a factor of 10. The coincidence ratio is found to also be proportional to the fragment mass loss for fragments with the beam velocity. A two-step mechanism is sketched out to describe these results.
Published: 2000
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42. Evidence for particle stability of F and particle instability of N and O

Author: D. Beaumel, Nakamura Takahiro, Yu. E. Penionzhkevich, M. Hirai, Eiji Ideguchi, H. Kumagai, Yoshiki Watanabe, Hiroshi Ogawa, Hironori Iwasaki, Masahiro Notani, Kenichiro Yoneda, Toshiharu Teranishi, K. Kusaka, M. Ishihara, N. Imai, N. Aoi, S. M. Lukyanov, N. Fukuda, Hiroyoshi Sakurai, A. Yoshida, and T. Kubo
Subjects: Physics, Nuclear and High Energy Physics, Isotope, Nuclear Theory, Particle stability, chemistry.chemical_element, Oxygen, Instability, chemistry, Fluorine, Nuclear drip line, Physics::Chemical Physics, Atomic physics, Nuclear Experiment, Projectile fragmentation
Abstract: The neutron drip line up to fluorine has been investigated by the projectile fragmentation of a 94.1A MeV 40 Ar beam at the fragment separator RIPS at RIKEN. A new neutron-rich isotope, 31 F, has been observed for the first time while clear evidence for the particle instability of 24,25 N, 27,28 O and 30 F has been obtained. The sudden change in stability from oxygen to fluorine may demonstrate the onset of deformation for the neutron-rich fluorine isotopes.
Published: 1999
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43. Beta-delayed proton spectroscopy of

Author: Hiroyoshi Sakurai, D. Beaumel, Arup Bandyopadhyay, Alok Chakrabarti, Kenichiro Yoneda, T. Kubo, Kosuke Morita, Hiroshi Ogawa, V. Banerjee, and S. M. Lukyanov
Subjects: Physics, Nuclear and High Energy Physics, Proton, Isotope, Projectile, Proton decay, Nuclear Theory, Detector, Nuclear physics, Beta (plasma physics), Physics::Accelerator Physics, Atomic physics, Proton emission, Nuclear Experiment, Spectroscopy
Abstract: Recently an experiment has been carried out at RIKEN, Japan, using the projectile fragment separator RIPS to test a new approach of studying -delayed proton emitters. The approach consists of reduction of contamination from neighbouring isotones and isotopes by using a set of Al absorbers at the RIPS focal plane and stopping the fragments of interest on a thin foil placed in front of a gas -Si E detector telescope for delayed proton measurement. These two together have led to a remarkable reduction of -background in the delayed proton spectrum of and a number of new levels in decaying by proton emission to have been observed. The details of the technique and the results obtained from the -delayed proton decay of will be discussed.
Published: 1998
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44. A new phenomenon in heavy ion inelastic scattering: the towing mode

Author: J.A. Scarpaci, A. van der Woude, N. Frascaria, T. Suomijärvi, J.C. Roynette, F. Maréchal, D. Beaumel, Ph. Chomaz, V. Pascalon-Rozier, I. Lhenry, J.R. Jongman, Y. Blumenfeld, H. Laurent, Denis Lacroix, P. Roussel-Chomaz, Research unit Nuclear & Hadron Physics, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Physique théorique, Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)
Subjects: Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Nuclear Theory, Mode (statistics), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Inelastic scattering, Deep inelastic scattering, 01 natural sciences, Inelastic neutron scattering, Spectral line, Coincidence, Nuclear physics, 0103 physical sciences, SPECTRA, Atomic physics, 010306 general physics, Nucleon, DECAY, Excitation
Abstract: The inelastic scattering of Ar-40 on Ni-58 has been studied at 44 MeV per nucleon incident energy in coincidence with light particle emission. Besides the well known mechanisms of inelastic excitation, pick up break up and nucleon knock out, a new phenomenon has been observed, giving rise to fast forward moving particles with specific angular correlations. This newly observed mechanism seems to be a generic phenomenon present for various projectile-target combinations and incident energies. Its contribution to the inelastic spectrum has been extracted and a tentative interpretation is given. (C) 1998 Elsevier Science B.V. All rights reserved.
Published: 1998
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45. Experimental study of the two-body spin-orbit force in nuclei

Author: I. Matea, J. Guillot, Toshio Suzuki, Julien Gibelin, G. Burgunder, D. Beaumel, L. Nalpas, A. Obertelli, J. C. Thomas, I. Stefan, S. Giron, Riccardo Raabe, J. Pancin, Takaharu Otsuka, Fairouz Hammache, N. de Séréville, L. Caceres, A. Lepailleur, C. Stodel, S. Grévy, M Moukaddam, A. Gillibert, F. Nowacki, J. A. Scarpaci, O. Sorlin, Eric Clément, J. P. Ebran, A. Matta, S. Franchoo, F. Flavigny, B. Fernández-Domínguez, Alfredo Poves, G. Duchêne, and UAM. Departamento de Física Teórica
Subjects: Physics, Inverse kinematics, 010308 nuclear & particles physics, Nuclear Theory, General Physics and Astronomy, Física, 01 natural sciences, medicine.anatomical_structure, Amplitude, 0103 physical sciences, Atomic nucleus, medicine, Orbit (dynamics), Nuclear force, Atomic physics, 010306 general physics, Spin (physics), Constant (mathematics), Nuclear Experiment, Nucleus
Abstract: Artículo escrito por un elevado número de autores, solo se referencian el que aparece en primer lugar, el nombre del grupo de colaboración, si le hubiere, y los autores pertenecientes a la UAM, Energies and spectroscopic factors of the first 7/2−, 3/2−, 1/2−, and 5/2− states in the 35Si21 nucleus were determined by means of the (d, p) transfer reaction in inverse kinematics at GANIL using the MUST2 and EXOGAM detectors. By comparing the spectroscopic information on the 35Si and 37S isotones, a reduction of the p3/2-p1/2 spin-orbit splitting by about 25% is proposed, while the f7/2-f5/2 spin-orbit splitting seems to remain constant. These features, derived after having unfolded nuclear correlations using shell model calculations, have been attributed to the properties of the two-body spin-orbit interaction, the amplitude of which is derived for the first time in an atomic nucleus. The present results, remarkably well reproduced by using several realistic nucleon-nucleon forces, provide a unique touchstone for the modeling of the spin-orbit interaction in atomic nuclei
Published: 2014

46. Interstrip effects influence on the particle identification of highly segmented silicon strip detector in a nuclear reaction scenario

Author: N. de Séréville, A. Jallat, A.M. Sánchez Benítez, V. Le Ven, Ismael Martel, Fairouz Hammache, B. Genolini, J.A. Dueñas, Y. Blumenfeld, D. Mengoni, T. Faul, S. Ancelin, B. Le Crom, D. Beaumel, D. Suzuki, M. Assié, E. Rauly, Institut de Physique Nucléaire d'Orsay (IPNO), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
Subjects: Physics, Nuclear reaction, Nuclear and High Energy Physics, Silicon, business.industry, Preamplifier, Physics::Instrumentation and Detectors, [PHYS.PHYS.PHYS-ACC-PH]Physics [physics]/Physics [physics]/Accelerator Physics [physics.acc-ph], Detector, chemistry.chemical_element, Observable, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, Particle identification, Optics, chemistry, 13. Climate action, Pulse shape analysis, Silicon detector, business, Nuclear Experiment, Instrumentation
Abstract: Identification of the interstrip effects using digital pulse shape analysis is for the first time reported. This study is performed on a highly segmented double-sided silicon detector used in a nuclear reaction in which a large range of particles at different energies are produced. The output current pulse of the preamplifier is employed as observable. The interstrip effects diminish the capability of particle identification at energies below 5 MeV, especially on the injection side of the detector.
Published: 2014
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47. Digital pulse-shape analysis with a TRACE early silicon prototype

Author: R. M. Perez-Vidal, Alberto Pullia, S. Capra, Ramón J. Aliaga, A. Gadea, M. Assié, D. Beaumel, Ismael Martel, Enrique Sanchis, C. Boiano, V. V. Parkar, J. J. Valiente Dobon, D. Mengoni, T. Houdy, V. Herrero-Bosch, P. R. John, J.A. Dueñas, A. Triossi, V. Gonzáles, L. Grassi, A. Gottardo, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Université Paris-Sud - Paris 11 (UP11)
Subjects: Physics, Nuclear and High Energy Physics, Silicon detector, Silicon, Physics::Instrumentation and Detectors, business.industry, Light-charged particles, Detector, chemistry.chemical_element, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Particle detector, Particle identification, Semiconductor detector, TECNOLOGIA ELECTRONICA, Optics, chemistry, Measuring instrument, Gamma-ray spectroscopy, Coaxial, business, Digital pulse shape analysis, Instrumentation, Electronic circuit
Abstract: [EN] A highly segmented silicon-pad detector prototype has been tested to explore the performance of the digital pulse shape analysis in the discrimination of the particles reaching the silicon detector. For the first time a 200 tun thin silicon detector, grown using an ordinary floating zone technique, has been shown to exhibit a level discrimination thanks to the fine segmentation. Light-charged particles down to few MeV have been separated, including their punch-through. A coaxial HPGe detector in time coincidence has further confirmed the quality of the particle discrimination. K.; 2014 Elsevier B.V. All rights reserved, This work has been supported by the Italian Ministry of Education, University and Research (MIUR) under the project FIRB/08-RBFR08RDKZ and partially supported by the Spanish Ministry of Science and Innovation (MICINN) under projects FPA2007-63074 (FINURA) and INGENIO-2010 (CPAN). The research leading to these results has received funding from the European Union Seventh Framework Programme FP7/2007-2013 under Grant Agreement no. 262010 ENSAR. One of the authors (V.V. P.) acknowledges the financial support through the INSPIRE faculty program, Department of Science and Technology, Government of India, in carrying out these investigations. The authors would like to extend appreciation to the technical staff of LNL Tandem for their assistance during the experiment and the local members of the EXOTIC project for their support in the preparation of the experimental setup
Published: 2014
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48. Proton emission in inelastic scattering of40Ca on40Ca at 50 MeV/nucleon

Author: A. van der Woude, J.C. Roynette, I. Lhenry, D. Beaumel, T. Suomijärvi, M. Lamehi-Rachti, J.A. Scarpaci, J.P. Garron, Ph. Chomaz, A. Gillibert, N. Frascaria, N. Alamanos, and Y. Blumenfeld
Subjects: Physics, Nuclear and High Energy Physics, Decay scheme, 010308 nuclear & particles physics, Nuclear Theory, Inelastic scattering, 01 natural sciences, 7. Clean energy, Resonance (particle physics), Charged particle, Nuclear physics, Giant resonance, 0103 physical sciences, Quadrupole, Proton emission, Atomic physics, Nuclear Experiment, 010306 general physics, Nucleon
Abstract: Inelastic scattering of {sup 40}Ca on {sup 40}Ca at 50 MeV/nucleon has been measured in coincidence with light charged particles detected over a large angular domain. The giant resonance region of the inelastic spectrum is shown to be dominated by the isoscalar giant quadrupole resonance. The characteristics of the emitted protons allow us to separate four reaction mechanisms contributing to the high excitation energy region of the inelastic spectrum (E{sup {asterisk}}{gt} 30 MeV): pickup breakup, knockout, inelastic scattering to high-lying target states, and a new mechanism responsible for the emission of fast-moving protons. A sizable direct decay branch towards hole states of {sup 39}K is measured for the giant quadrupole resonance in {sup 40}Ca. Evidence is given for the excitation of the two-phonon giant quadrupole resonance, characterized by its direct decay scheme. The energy and width of this two-phonon state are in agreement with a harmonic picture for collective nuclear excitations. {copyright} {ital 1997} {ital The American Physical Society}
Published: 1997
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49. New indirect study of the 12 C(α,γ) 16 O reaction via the 12 C( 7 Li,t) 16 O transfer reaction

Author: A. Bouda, A. Lefebvre-Schuhl, Jürgen Kiener, Pierre Descouvemont, Fairouz Hammache, Laurent Audouin, D. Beaumel, Vincent Tatischeff, L. Gaudefroy, M. G. Pellegriti, S. Fortier, N. Oulebsir, and P. Roussel
Subjects: Transfer (group theory), Chemistry, Physical chemistry
Published: 2013
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50. The(7Li,7Beγ) reaction and isovector spin strength inCa40

Author: S. E. Hirzebruch, T. Suomijärvi, I. Lhenry, S. Danczyk, S. Gales, J. Stasko, G. M. Crawley, J. S. Winfield, D. Beaumel, J.M. Maison, and H. Laurent
Subjects: Physics, Nuclear and High Energy Physics, Dipole, Isovector, Giant resonance, Spin transfer, Resonance, Atomic physics, Energy (signal processing), Excitation, Spin-½
Abstract: The $^{40}\mathrm{Ca}$${(}^{7}$Li,${\mathrm{}}^{7}$Be\ensuremath{\gamma}) reaction at E${(}^{7}$Li)/A = 70 MeV has been used to investigate isovector giant resonances and to measure the ratio of \ensuremath{\Delta}S=1 to \ensuremath{\Delta}S=0 spin strength in $^{40}\mathrm{Ca}$ at high excitation energy. In the singles spectrum, the analogue of the giant dipole resonance is observed. Another resonance is observed at ${\mathit{E}}_{\mathit{x}}$\ensuremath{\approxeq}15 MeV in the residual nucleus, which we suggest is a collective ${2}^{\mathrm{\ensuremath{-}}}$ state. The isovector spin transfer strength at high excitation for the calcium target is compared to that measured with a carbon target under the same experimental conditions. Although more spin transfer strength at high excitation is observed for the calcium target than for the carbon target, this only accounts in part for an apparent discrepancy between previous $^{40}\mathrm{Ca}$(p\ensuremath{\rightarrow},p${\ensuremath{\rightarrow}}^{\ensuremath{'}}$) and $^{12}\mathrm{C}$${(}^{7}$Li,${\mathrm{}}^{7}$Be) experiments. The general utility of the ${(}^{7}$Li, $^{7}\ensuremath{\gamma}$) reaction is discussed. \textcopyright{} 1996 The American Physical Society.
Published: 1996
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